Proof that the area of a parallelogram is the product of any two adjacent sides and the sine of the angle between them.

Question

given a parallelogram, show that the area of the parallelogram follows the relationship of two adjacent sides times sin of the angle between them.

I tried dividing the Parallelogram into two congruent triangles, then finding out if I could get a relationship using the law of sines since I am stuck on how to integrate sin of the diagonal into the relationship.